| 1. | The verb must be in the present perfect tense
动词必须用现在完成时态。
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| 2. | " recently " has the widest use , in positive and negative statements and questions , with the past tense and the present perfect tense
“recently”用法最广，可用于肯定式陈述句、否定式陈述句及疑问句中，与过去时态和现在完成时态连用。
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| 3. | To grasp the usage of the present perfect tense
掌握现在完成时态的用法
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| 4. | Present continuous and present perfect passives with prepositions of cause
现在进行式和现在完成式
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| 5. | Present perfect continuous tense
现在完成进行时
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| 6. | Present perfect tense
过去完成时
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| 7. | To grasp “ the present perfect ” and the irregular verbs ' past tense & past participle tense
掌握现在完成时态以及不规则动词的过去时态和过去分词。
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| 8. | We use the present perfect to talk about something that began in the past and still continues now
我们使用现在完成式去说明某事开始于过去并持续到现在。
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| 9. | Present perfect as opposed to past simple . past simple as opposed to past continuous and past perfect
现在完成时和一般过去时的对比；一般过去时和过去进行时、
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| 10. | The present perfect tense is always connected with present time ， hence it is net used with “ yesterday ” ， “ last year ” ， etc
现在完成时总是和现在有关，所以它不能和“昨天” 、 “去年”等一起用。
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